Chemistry Practice Questions

A scientist has two containers. Inside each container is a blue liquid. The liquids are substances. What can the scientist do to help find out whether these two liquids are both the same substance? Choose all correct answers.

• Weigh each liquid and compare the weights.

• Measure the temperature of each liquid and compare the temperatures.

• Measure the masses and volumes of the two liquids and calculate and compare the densities.

• Measure the volume of each liquid and compare the volumes.

Tags

NGSS.MS-PS1-2

You find a clear gem that is made of one substance. What could you do to identify whether the gem is a diamond? Choose all correct answers. Assume you don't care about destroying it.

• Determine its hardness and compare it to the hardness of other gems, including diamonds.

• Determine its melting point and compare it to the melting point of other gems, including diamonds.

• Determine its shape and compare it to the shape of other gems, including diamonds.

• Measure its length and compare it to the length of other gems, including diamonds.

Your lab partner tested the solubility of the sugar, which is a pure substance. One sample came from a sugar packet and the other from sugar cubes. Choose all true statements.

• The sugar from the packet was soluble in water, while the sugar from the cubes was not.

• The sugar cubes had a different color.

• The sugar packet and sugar cubes have the same densities.

• The sugar packet and the sugar cubes both had the same melting points.

Chalk is a pure substance. A scientist has one large piece of chalk and one small piece of chalk. Choose all of the true statements.

• Both pieces contain nothing but chalk molecules.

• The small piece has particles that are packed closer together.

• Both pieces have the same number of molecules.

• Both pieces have the same hardness.

A scientist has a piece of pure copper. It has a mass of 18 grams and a volume of 2 ml. What is its density?

• 9 g/ml

• 16 g/ml

• 20 g/ml

• 36 g/ml

Which of the following are properties? Choose all that apply.

• Hardness

• Color

• Mass

• Shape

Tags

NGSS.MS-PS1-2

Which of the following are pure substances? Choose all that apply.

• sand

• 24 karat gold

• milk

• distilled water

Which of the following are mixtures? Choose all that apply.

• air

• diamond

• tap water

• saltwater

Which of the following are mixtures? Choose all that apply.

• A

• B

• C

• D

Tags

NGSS.MS-PS1-1

Which one is denser?

• A

• B